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Combustion Analyzer Calibration?
I own a Bacharach Insight combustion analyzer that is only used for servicing my mod-con boiler. It is fully functional with no issues. I replaced both O2 and CO sensors in Oct. 2017. The replacement CO sensor was factory pre-calibrated about two weeks prior to it's installation and set up. The O2 sensor currently shows 92% remaining. My question is to those who use combustion analyzers regularly, How much drift do you see in the CO values over the course of a typical season? Is this something you pay attention to, or do you simply have them recalibrated annually? Would you expect to see any significant drift in CO values if used only occasionally?